Electric-motor power-transmitting device.



No. 703,942. Ptnted .IuIy I, |902.

' H. S. MILLER & G. C. MARX.

ELECTRIC MOTOR POWER TRANSIIIITTING DEVICE. I

(Application filed Nov. 30, 1901.:

(No Model.) 3 Sheetsw Sheet I,

TH: Nanms FUER: coA Puorwnnu., wAsmNoTcn. n. c

' No. 703,942. Patented luy I, |902. H,. S. MlLLER & G. (L. MARX.ELECTRIC HUTDB POWER TRANSMITTING DEVICE.

(Application filed Nov 30, 1901.'

(Nu Model.; 3 Sheets-Sheet 2.

'uunnnllglllll l u i No. 703,942. Patented luly I, |902.

H. s. MILLER & G. C. MARX.

ELECTRIC MOTOR POWER TRANSMITTING DEVICE.

Application filed Nov. 30, 1901.) (No Model.)

3 Sheets-Sheet 3.

UNITED STATES PATENT OEErcE.

HERBERT s. MILLER AND GUsTAvE o. MARX, or ELIZABETH, NEW JERSEY,

ASSIGNORS TO DIEHL MANUFAOTURNG NEW JERSEY.

COMPANY, A CORPORATION OF 'ELECTRIC-MOTOR POWER-TRAIN SM ITTING DEVICE.

SPECIFICATION forming part of 'Letters Patent No. 703,942, dated .my 1,l1902.

Application iled November 30, 1901. Serial No. 84,258.y (No model.)

To all whom, it may conoc-77,.'

s Be it known that we, HERBERT S. MILLER and GUsTAvE C. MARX, citizensof the United States, residing at Elizabeth, in the county of Union andState of New Jersey, have invented certain new and useful ImprovementsinElectric-Motor Power-Transmitting Devices, of which the following isaspecication, reference being had therein to the accompanying 1odrawings.

This invention has for its object to provide a simple and efficientelectric-motor powertransmitting device more especially intended tobeapplied to sewing-machine stands or tables for the purpose of drivingthe sewingnnachines mounted thereon and constructed for readyapplication to sewing machine stands or tables now invuse insubstitution of or interchangeable withthe treadle-'operated aodriving-wheels with which said stands or tables are provided. Theinvention is, however, suitable for use in connection with othermachines than sewing-machines.

The improvement comprises an electric motor the rotating shaft of whichis provided with a pulley and a brake-wheel, against which latter whenthe motor and driven machine are at rest or are to be stopped a movablebrake device mounted on the motor-frame is 3o forced by a suitablespring, and preferably connected with said brake device, so as to bemovable therewith, is a contact arm or device, through which and one ofthe contacts of a rheostat, over which said contact arm or device moves,the current passes to the motor when the latter is to ru-n, but whichcontact arm or device is moved into such position as to break thecircuit when the brake is applied to the brake-wheel of the motor andwhen 4o the said motor and the machine driven thereby are to be stoppedor are to be at rest. The rheostat is preferably rigidly connected withor mounted on the frame or support of the motor, and the said frame orsupport is pref-- erably hinged to or pivotally mounted on thesewing-machine stand, so that by adjusting said frame on its hinged orpivotal connection with said stand the motorpulley can be moved from ortoward the pulley of the driven machine to tighten or slacken thedriving- 5o belt connecting said pulleys. The movable contact arm ordevice referred to and which makes or breaks the circuit and the brakearm or device niovable'therewith are preferably connected with theordinary sewing-machine heel-and-toe or double-acting treadle, so astobe moved thereby to make or break the circuit and so thatbyaheel-pressure on the treadle the spring-pressure of the brake on thebrake-wheel may be supple- 6o mented or addedk to if it bedesired tostop the motor very quickly when itis running rapidly.

In the accompanying drawings, Figure 1 is a front view of asewing-machine drop stand or table with the invention applied thereto.Fig. 2 is an end view of the same looking from the right of Fig. 1, theparts to the right of the line 2 2, Fig. 1, being omitted. Fig. 3 isadetailview of the motor, partly in section. 7o Fig. t is a detail viewof the belt-holding device unlatched to slack'en the belt. Fig. 5 showsa modified form of the invention, and Fig. G is an enlarged detail viewof a part of Y the same.

Referring to the drawings, 12 denotes the legs or side frames of thestand, supporting the table 13, on which the sewing-machine 14 ismounted, said legs or side frames being connected by the usual brace15.\-7'llhg0lic.. 8o t\ri-c r n qt or contained infa-eastng-lwhich isrigidly connected to or formed integral with a support or bracket 17,hinged or pivoted to the brace 15 by center' screws 18 or otherwise.Rigidly connected with the said motor as@ hi11s@derrpomLnnclmtisa.naav0st'h...0;i l9.hIeninea.serieaefente@15S 20e Th'e'hinged supportorbracketj17 hasmai tical bar 21, provided near its top and bottom withadjusting-screws 22, abutting against a 9o vertical bar 23 of the brace15, and to tighten or slacken the drivin g-belt 24, connecting themotor-pulley 25 with the driving-pulley 26 of the sewing-machine, one ofthe said screws may be turned in and the other be turned out to changethe position of the motor and its pulley,and thus effect any desiredadjustment of said motor-pulley. These screws, in coperation with thebar 23, also serve to hold the movable motor in any position to which'it may be adjusted, as will be understood.

Fixed to the shaft of the motor adjacent to the pulley 25 is abrake-wheel 27, and hinged to the mot-or support or frame is a brakelever or arm 28, having a brake-shoe 29, normally pressed against saidbrake-wheel by a torsionalcoil-spring 30, acting on said brakelever. Therheostat box or frame is provided with a swinging arm or lever 3l, whichcarries a contact plate or switch 32, arranged to engage any one of thecontacts 2O of the rhe ostat, said arm or lever 3l being connected by alink or pitman 33 with the brake-lever 2S and by a second link or pitman34 with the heel-and-toe treadle' 35, pivotally mounted in the usualmanner in the brace l5.

From the foregoing it will be understood that by depressing the forwardor toe portion of the treadle 35 thebrake-shoe 29 will be removed fromcontact with the brake-wheel`27 of the electric motor, such movement ofthe treadle also causing the contact plate or switch 32 (which isunderstood to be in electrical connection with a source of electricity)to touch some one of the contacts 2O of the rheostat, and thus start themotor and the sewing-machine driven thereby. The contacts of therheostat are so arranged that an increasing speed of the motor issecured as the toe portion of the treadle is moved farther downward, andvice versa, so that the sewing-machine may be driven at any desiredspeed.

To stop the machine,tl1e toe-pressure on the treadle is released, whenthe spring 39 instantly removes the contact plate or switch 32 from thecontacts of the rheostat to break the electric circuit, and said springsimultaneously forces the brake-shoe 29 into fricvtional contact withthe brake-wheel 27 of the motor to quickly stop the latter. Should therunning speed of the motor be such that the stress of the spring 30 isinsufiicient to stop the machine as quickly as might be desired, thepressure of the brake-shoe on the brake- Wheel may be augmented orincreased by a heel-pressure on` the treadle, so that an npward pressurefrom the toe portion of the treadle is transmitted to the brake shoethrough the link or pitman 34, the rheostat arm or lever 31, the link orpitman 33, and the brake arm or lever 28, these parts affording apositive connection between said treadle and brake-shoe.

The driving-belt 24, connecting the pulleys 25 and 26, preferably runsover an idler-pulley 36, carried by a swinging arm 37, hinged to abracket 39, rigidly attached to one of the legs or side frames of thestand, said swinging arm being provided with a catch 40, engaged by apivoted latch 41, pivoted to a part up on its hinges on the table, (foraccess to 7o the lparts beneath the work-plate of the niachine orpreparatory to lowering the machine into its receptacle beneaththe tableof the drop-stand,) the latch 4l may be lifted out of engagement withthe catch 40, thus freeing the swinging arm 37 and loosening the saidbelt. When the ybeltis loosened or slackened,

it is still retained in the groove of the idlerpulley 36 by the plate orsmall bracket 42, at-

tached to the said swinging arm 37 and over- 8o lying said belt.

Owing to the fact that the motor support or bracket 17 and the centerscrews, on which said support or bracket is hinged or pivoted,

occupy the position which is usually occupied by the treadle-operateddriving-wheel of the sewing machine stand and the shaft and pivot orpivots of said wheel, the electric motor herein shown and described isadapted to be applied to sewing-machine stands now 9o in use simply byremoving the driving-wheel mechanism and treadle-pitman from the standand substituting therefor the parts herein shown and described, and themachine may be readily changed back to a foot-power machine by removingthe electric motor and appurtenances herein shown and described andreplacing the treadle-operated driving-shaft and pitman.

Instead of having the motor pivotally roo mounted on the brace of themachine, as in the construction already described, it maybe movablymounted, as shown in Fig. 5, on a horizontal bracket 43, attached to thetable ingly mountedon\said bracket, so as to be adjustable horizontally''by a thumb-screw 44 to tighten or slacken the driving-belt, the motorbeing also retained in any desired position of adjustment by the saidthumb-screw, 11oY f which is swiveled in a boss 45 of the said bracket43and tapped at its inner end in said motor-frame. In this form of theinvention the motor brake-lever is connected with the treadle in thesaine-manner as in the construction already described, excepting thatthe lower link or pitman of the connections is somewhat longer to reachthe treadle; also, in this form of the invention it is not necessary toremove the ordinary treadle-operated 12o driving-wheel 46 of the stand,and thus the machine may be quickly converted from a treadle-operatedmachine to a motor-operated machine or back again to a treadleeoperatedmachine simply by removing the ordinary driving-wheel pitman andsubstituting the pitman 34, as will be readily understood. y

The present invention is not necessarily limited in its use tosewing-machine stands,

j as it is also adapted for other uses in which 13o the motors areseparate fromthe machines to be driven, as for driving graphophones andthe like, nor is the invention necessarily limited to motors movably oradjustably mounted in stands or to treadle-operated motor-controllingdevices. It will be observed, however, that in the present invention, asherein illustrated, the brake is mounted directly on the motor-frame, sothat it is always present in operative relation to the brake-wheel onthe driving-shaft of the motor, and the addition to the motor of aspecial brake device is therefore not required, as has been necessary insome devices heretofore in use.

Having thus described our invention, we claim and desire to secure byLetters Patent- 1. The combination with a sewing or other machine to bedriven, of an electric motor the shaft of which is separate from saidmachine and which motor-shaft is provided with a brake-wheel, a brake toengage said wheel and which is mounted on the motor-frame, and a switch,to make and break the electric circuit, connected with said brake sothat when the circuit is broken the said brake will be applied to saidbrake-wheel, and when the circuit is closed the said brake will beremoved from said wheel.

2. The combination with a sewing or other machine to be driven, of anelectric motor the shaft of which is separate from said machine andwhich motor-shaft is provided with a pulley and a brake-wheel, a braketo engage said brake-wheel and which brake is mounted on themotor-frame, a switch, to make and break the electric circuit, connectedwith said brake so that when the circuit is broken the said brake willbe applied to said Wheel, and when the circuit is closed the said brakewill be removed from said brake-wheel, and a rheostat having a series ofcontacts with any one of which the said switch may be placed in contactwhen the circuit is to be closed. y

3. The combination with a sewing or other machine to be driven, of anelectric motor separate from said machine and the shaft of which isprovided with a pulley and a brake- Vwheel, a brake'to engage saidbrake-wheel and which brake is mounted on the motorframe, a switch, tomake and break the electric circuit, connected with said brake so thatwhen the circuit is broken the said brake will Vbe applied to saidwheel, and when the circuit is closed the said brake will be removedfrom said wheel, a rheostat having a series of contacts with any one ofwhich the said switch may be placed in contact when the circuit isclosed, and a heel-and-toe treadle positively connected with said brake.

4. An electric motor the shaft of which is provided with a pulley fortransmitting power and with a brake-Wheel, combined with aspring-pressed brake-lever mounted on the motor-frame'and provided witha brake normally pressed against said brake-wheel by itscontrolling-spring.

5. The combination with a stand or table comprising side frames or legsand a brace vconnecting the same, of a'machine to be driven mounted onsaid stand or table and provided with a pulley, an electric motorhavinga hinged or pivoted connection with the said brace and the shaftof which motor is provided with a pulley to be belted to thesaid'rst-named pulley, so that by changing the position of said motor,by swinging it on its hinged or pivotal connection with said brace,thebelt connecting said pulley may be tightened or loosened, and means forsecur ing said motor in any desired position of adjustment.

6. The combination Witha sewing-machine stand comprising legs or sideframes and a connecting-brace, said stand being provided with a treadle,of an electric motor pivotally mounted in said stand and provided with apulley and a brake-wheel, a sewing-machine supported by said stand andhaving a pulley to be driven, a brake to engage said brake-wheel, meansfor adjusting said motor on its hinged or pivotal mounting on said standand for holding said motor in -any desired position of adjustment, and arheostat having a series of contacts to be engaged by said switch; theparts being so arranged that when said treadle is moved to disengagesaid brake from the brake-wheel the current may be turned onto saidmotor and so that the electriccircuit may be broken when the said brakeis applied to said brake-wheel.

7. The combination witha sewing-machine or similar stand or tableprovided with a treadle and with means for mounting atreadleoperateddriving-wheel in or on said stand or table, of an electric motorprovided with means whereby it may be attachedto said stand or tableinterchangeably with and in the place at which the said driving-wheel isnormally mounted, so that the motor-attaching devices occupy theposition usually occupied by the driving-wheel mountings when the saidelectric motor is employed as a substitute for foot-power.

8. The combination with a stand or table provided with bearings suitablefor receiving the band-wheel shaft and driving-wheel of a treadledriving device, and with a treadle mounted in the lower portion of saidstand or table, of a machine to be driven mounted on said stand ortable, an electric motor having a frame provided with journals iitted tosaid band-wheel shaft-bearings, means for maintaining said motor -framestationary upon said stand or table when applied thereto, means forcontrolling the operation of said motor, a connection from saidcontrolling means to said treadle, and a connection from said motor tosaid machine to be driven.

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9. The combination with a stand or table said brake on said brake-Wheelmay be coil-Y and a machine to be driven mounted thereon, trolled bysaid treadle. of an electric motor the shaft of which is sepa- Intestimony whereof We ax our signarate from the shaftof the machine to bedriven tures in presence of two Witnesses. 5 and which motor-shaft isprovided with a 1 brake-wheel, abrake mounted on the motorframe adjacentto said brake-Wheel, and a treadle mounted in the lower part of saidWitnesses: i stand or table and positively connected with W. E.CARMIGHAEL, xo said brake so that the frictional pressure of HENRY J.MILLER.

